High 7.1Published Sep 27, 2026

CVE-2026-101059utcp-http before 1.1.4 OAuth2 tokenUrl Trust Boundary Bypass

Updated under an hour ago (2026-10-19 07:50 UTC)

Does this affect you?

It affects universal-tool-calling-protocol python-utcp. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.18%, higher than 7% of scored CVEs.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for universal-tool-calling-protocol python-utcp

Exploited in the last 30 days

utcp-http before 1.1.4 fails to validate the OAuth2 tokenUrl field from remote OpenAPI specifications, allowing attackers to redirect credential submission to arbitrary endpoints. When a victim registers an attacker-controlled OpenAPI spec and invokes a generated OAuth2-protected tool, the library POSTs the victim's client_id and client_secret to the attacker-supplied token endpoint without URL validation.

CVSS: 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Weakness (CWE): CWE-918
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.18% (percentile 7)
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Sep 28, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

universal-tool-calling-protocol python-utcp universal_tool_calling_protocol:python_utcp (from the name)	before 1.1.4; 1.1.4 not affected	CNA record

References

https://github.com/universal-tool-calling-protocol/python-utcp/security/advisories/GHSA-8cp3-qxj6-px34vendor-advisory
https://www.vulncheck.com/advisories/utcp-http-before-1.1.4-oauth2-tokenurl-trust-boundary-bypassthird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.